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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 5 September 2020, Shift 1, Chemistry Q27

Question 27 of 75 in this shift, Chemistry question 2 of 25.

The increasing order of basicity of the following compounds is :

The figure, in words

Four ring structures labelled (A) to (D) as printed: (A) a six-membered ring containing one N atom, drawn with alternating double bonds; (B) a five-membered ring containing an N atom bearing H (N-H), drawn with two double bonds; (C) a five-membered ring containing an N atom bearing H (N-H), drawn with no double bonds; (D) a five-membered ring containing two N atoms, one of them bearing H (N-H), drawn with two double bonds.
  1. (1)(A) < (B) < (C) < (D)
  2. (2)(B) < (A) < (D) < (C)Official answer
  3. (3)(B) < (A) < (C) < (D)
  4. (4)(D) < (A) < (B) < (C)

Official answer

Option 2

NTA final key (Sep 2020).

Chapter
Amines
Topic
Amines
Idea tested
Basicity of Nitrogen Heterocycles

Same idea in other shifts

Asked 5× in all
  1. 9 Apr 2024, Shift 1 · Q78Correct order of basic strength of Pyrrole (five-membered ring with NH), Pyridine (six-membered aromatic ring with N) and Piperidine…MediumSingle correctHas a figure
  2. 27 Jan 2024, Shift 1 · Q77Which of the following is strongest Bronsted base ?EasyDiagram basedHas a figure
  3. 4 Aug 2021, Shift 2 · Q46For the compounds below given [structures I, II, III, IV: see figure_note] the correct order of basicity isMediumDiagram basedHas a figure
  4. 9 Jan 2020, Shift 2 · Q39The decreasing order of basicity of the following amines is :MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.